18 oz boxing gloves are for sparring. Rival puts 18 oz at 185+ lb (84+ kg) for sparring. Rival steps up to 18 oz over 185 lb; coaches holding pads often wear it too. The hand band for the cuff is 8.5–9.5", measured without wraps.
What 18 oz is for
18 oz gloves are made for sparring. Top Ten lists 18–20 oz for sparring (very heavy / coaching) at 100+ kg.
18 oz carries 6 oz more padding than a 12 oz bag glove to protect the partner, the step Rival recommends over 185 lb. It is not wider inside: the hand band decides the fit.
Bodyweight bands differ by brand
Rival’s adult sparring chart puts 18 oz at 185+ lb (84+ kg).
Below 90 lb, youth charts take over from the adult bands.
Hand and wraps
Measure the hand round the knuckles with the thumb out, without wraps. Rival’s 18 oz band is 8.5–9.5". Wraps fill part of the glove: at the top of the band with 180" wraps on, go one rung up.
Lighter: 16 oz. Heavier: Youth 6 oz.